book Maths Puzzle Numerical Ability

How do you simplify the following:

{{{ 0.419 = 1sqrt(1-(v^2/c^2)) }}}

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book Other Question

Find the equation of the line which is perpendicular to the line y =(1/2x)-4 and passing through the point (4, -2). Sketch the line and the perpendicular line in the same set of (x^2)^4 * x^3